title: The effect of dust-suppressant additives on the physical properties of an irreversible hydrocolloid.
abstract: The effects of dust-suppressant additives on certain physical properties of an irreversible hydrocolloid were studied in five test specimens formulated as follows: no additives (F0); 10% Duomeen cationic surfactant in 0.5% paraffin with 0.05% zinc stearate (F1); 10% Duomeen in 0.5% paraffin with 0.10% zinc stearate (F2); 20% Duomeen in 0.5% paraffin with 0.05% zinc stearate (F3); and 20% Duomeen in 0.5% paraffin with 0.10% zinc stearate (F4). The properties tested according to ADA specifications were mixing time, setting time, compressive strength, strain in compression, and permanent deformation under fixed strain. For each property, the variances between formulations were not significantly different (Levene p less than 0.05) whereas means were significantly different for stress (ANOVA p + 0.0001; Kruskal-Wallis p = 0.0019); strain (ANOVA p = 0.0003; Kruskal-Wallis p = 0.0228); deformation (ANOVA p = 0.0166; Kruskal-Wallis p = 0.0308). For the properties stress, strain, and permanent deformation under fixed strain, the paired differences of dust suppressants were established by using Duncan's multiple range test. Duomeen, instead of zinc stearate seems to be responsible for these effects.
authors.affiliation: Department of Prosthetic Dentistry, University of the Witwatersrand, School of Dentistry, Johannesburg, South Africa.
authors.forename: E
authors.initials: E
authors.lastname: Veres
authors.forename: J C
authors.initials: JC
authors.lastname: Slabbert
authors.forename: P
authors.initials: P
authors.lastname: Becker
mesh_terms: D000464:Alginates; D000704:Analysis of Variance; D003102:Colloids; D003799:Dental Stress Analysis; D004391:Dust; D006801:Humans; D008422:Materials Testing
chemical_list: D000464:Alginates; D003102:Colloids; D004391:Dust